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Best Spark Plugs for My Application #1473662 07/24/13 10:53 PM 07/24/13 10:53 PM
Joined: Dec 2003 Posts: 10,948 Spokane Valley, WA Big Bad Bee OP I Live Here
Big Bad Bee OP I Live Here Joined: Dec 2003 Posts: 10,948 Spokane Valley, WA	What spark plugs should I put in my 440 street car? It's 9.5 to 1, .040 over, Comp Cams XE274 cam, cast pistons, LY rods, RPM intake, Holley 750 vacuum secondaries, TTI 1/78 headers, 2.5" exhaust, H pipe, turbo mufflers to the rear bumper, 3.91 gears. I know these are pretty basic questions. I haven't run a performance V8 in decades... I’m listening.

Re: Best Spark Plugs for My Application [Re: Big Bad Bee] #1473663 07/24/13 10:57 PM 07/24/13 10:57 PM
Joined: Jan 2003 Posts: 20,968 A collage of whims topside Too Many Posts
topside Too Many Posts Joined: Jan 2003 Posts: 20,968 A collage of whims	What heads?

Re: Best Spark Plugs for My Application [Re: topside] #1473664 07/24/13 11:13 PM 07/24/13 11:13 PM
Joined: Dec 2003 Posts: 10,948 Spokane Valley, WA Big Bad Bee OP I Live Here
Big Bad Bee OP I Live Here Joined: Dec 2003 Posts: 10,948 Spokane Valley, WA	Closed chamber. 2.14/1.81 Harland Sharpe Roller Rockers, ball/cup push rods. MP electronic ignition conversion kit. I’m listening.

Re: Best Spark Plugs for My Application [Re: Big Bad Bee] #1473665 07/25/13 01:07 AM 07/25/13 01:07 AM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	Closed chamber factory iron heads or aluminum ? Ron

Re: Best Spark Plugs for My Application [Re: 383man] #1473666 07/25/13 02:10 AM 07/25/13 02:10 AM
Joined: Dec 2003 Posts: 10,948 Spokane Valley, WA Big Bad Bee OP I Live Here
Big Bad Bee OP I Live Here Joined: Dec 2003 Posts: 10,948 Spokane Valley, WA	Quote: Closed chamber factory iron heads or aluminum ? Ron Factory Iron with a pretty aggressive port and polish. I’m listening.

Re: Best Spark Plugs for My Application [Re: Big Bad Bee] #1473667 07/25/13 03:47 AM 07/25/13 03:47 AM
Joined: Oct 2006 Posts: 427 Sweden Mopar Guy mopar
Mopar Guy mopar Joined: Oct 2006 Posts: 427 Sweden	Looks like a good choise on the cam shaft ! I would start on a plug whit heat range 6 (NGK) or 12 (Champion) and see what the plugs look like after some driving if whe are talking about a car for the street but if you are gona run it on a track maybee a bit colder plugs.

Re: Best Spark Plugs for My Application [Re: Big Bad Bee] #1473668 07/25/13 10:58 AM 07/25/13 10:58 AM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	RJ12YC's should work great on that always did for me on iron heads.

Re: Best Spark Plugs for My Application [Re: Big Bad Bee] #1473669 07/25/13 11:37 AM 07/25/13 11:37 AM
Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually B BradH Taking time off to work on my car
BradH Taking time off to work on my car B Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually	Quote: Quote: Closed chamber factory iron heads or aluminum ? Ron Factory Iron with a pretty aggressive port and polish. Accel 137 and Autolite 75 worked well for me w/ similar compression and iron heads. Higher compression (or poor quality pump fuel) could require going a bit colder, which would be Accel 134 and Autolite 73. I did NOT have good results w/ the latest Champion equivalents and suggest you pass on those particular plugs.

Re: Best Spark Plugs for My Application [Re: BradH] #1473670 07/25/13 02:14 PM 07/25/13 02:14 PM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	In my mild iron headded 440 I ran Autolite 73's and 74's. Both worked good and never fouled even with all my street driving. Ron

Re: Best Spark Plugs for My Application [Re: 383man] #1473671 07/25/13 02:24 PM 07/25/13 02:24 PM
Joined: Aug 2003 Posts: 43,352 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,352 Bend,OR USA	Quote: In my mild iron headded 440 I ran Autolite 73's and 74's. Both worked good and never fouled even with all my street driving. Ron Me too I also used the RJ10YC and Accel 134 Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Best Spark Plugs for My Application [Re: Big Bad Bee] #1473672 07/25/13 02:26 PM 07/25/13 02:26 PM
Joined: Jul 2004 Posts: 19,318 State of confusion T Thumperdart I Live Here
Thumperdart I Live Here T Joined: Jul 2004 Posts: 19,318 State of confusion	NGK #6 or 7............I wouldn`t put a Champion in a lawnmower and Autolites didn`t live for me personally. 72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....

Re: Best Spark Plugs for My Application [Re: Thumperdart] #1473673 07/25/13 07:44 PM 07/25/13 07:44 PM
Joined: Dec 2003 Posts: 10,948 Spokane Valley, WA Big Bad Bee OP I Live Here
Big Bad Bee OP I Live Here Joined: Dec 2003 Posts: 10,948 Spokane Valley, WA	Great! Thank you, gents! I’m listening.

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